Only the jumbo version add-on adds to the shipping cost. You pay an additional $9 for shipping the jumbo version to Canada for each per copy you order. Shipping the jumbo version add-on overseas will cost you an additional $14 per copy you order.
Note that you may only use add-ons if you chose a reward worth $14 or more.
The card abilities are mostly all unique. Maybe two of them are the same as in Camelot, but every card has a unique color and ability combination. When I reuse abilities, which isn't often, I try to make sure the color of the card is different.
1. Go to the right hand corner and click "manage."
2. Click on "change your pledge."
3. Add the add-on cost to the current total and continue.
4. At the end of the campaign you will get a survey asking for your address & reward info. Include the add-ons.
Yes, any version printed in 2017 or after. The original Crazier Eights (first edition) was printed by a different company and the quality is different, but the original Crazier Eights game wouldn't be very interesting to mix with later versions anyway.